Neither the life of an individual nor the history of a society can be understood without understanding both.

Knowledge has value only insofar as it contributes to the liberation of humanity.

解释：树立品德，莫如日积月累，不懈怠地培植；治疗疾病，莫如彻底消除，不留下任何病根。

儿童的一切教育都必须遵循一个原则，即帮助孩子身心自然的发展。

There is only one boss. The customer. And he can fire everybody in the company from the chairman on down, simply by spending his money somewhere else.